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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Advanced Characterization Techniques for Quantifying and Modeling Deformation
Presentation Title Dominant Axes of Orientation Distributions and the Peculiar Case of [111] Grains in Tension
Author(s) Wolfgang Pantleon
On-Site Speaker (Planned) Wolfgang Pantleon
Abstract Scope During plastic deformation grains of initially uniform orientation develop an orientation spread due to accumulation of dislocations in their deformation structure. The orientation spread of each individual grain is characterized by the width of the micro orientation distribution function and its principal axes. The shape of the orientation distribution and, in particular, the dominant axis of disorientations enables unveiling the pattern of activated slip systems in the grain. As an example, tensile deformation of polycrystalline face centered cubic metals is discussed. The majority of models for polycrystalline plasticity, which take into account the possibility of developing orientation spreads, predict the dominant disorientation axis to be perpendicular to the tensile axis. Experimental evidence from EBSD investigations on copper and aluminium reveals that grains oriented with their crystallographic [111] direction along the tensile axis actually contradict this expectation. Their exceptional behavior is traced to a peculiar activation pattern of the slip systems.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

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